Finding the Fourth Proportional to 2,390.98, 3,586.46 and 931.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,390.98 : 3,586.46 = 931.15 : x
2. Step 2: Convert to fraction form
   2,390.98/3,586.46 = 931.15/x
3. Step 3: Cross multiply
   2,390.98x = 3,586.46 × 931.15
4. Step 4: Simplify right side
   2,390.98x = 3,339,532.23
5. Step 5: Solve for x
   x = 3,339,532.23/2,390.98
6. Step 6: Final answer
   x = 1,396.72